I received my new Terminator DSP board today. I've plugged it in and have been listening to it for a short while. Specifically, I'm listening/ watching a movie that I'm very familiar with and use as one of my test tracks. Right out of the box my impressions coincide with what others have stated: greater clarity and focus; in a sense digging deeper into the recording offering greater three dimensionality and relief or separation which in turn is revealing more detail -- background vocals and sounds are more distinct/audible. Finally with greater separation & focus the dynamic contrast is heightened.
I'm running a Denon 3910 via a high quality SPDIF/RCA cable (coax) and using the NOS setting. Also, since others have reported issues with the optical input, I have hooked that up as well to test it and it is working fine for me -- no issues -- sounds great as well.